riscv64: explicit Bare-mode satp switch (item 4.3.5a)
Punch list §25 item 4.3.5a complete. Firmware (EDK2 RISC-V) leaves Sv57 paging active at kernel entry with an identity mapping that has at least one confirmed hole (PLIC threshold register). Verified live before acting: satp.MODE/PPN and __kernel_start's address confirmed identity mapping; switched to Bare mode (csrw satp, x0 + sfence.vma) in arch_early_init(), ahead of pmm_init()/vmm_init(). Three-arch acceptance boot clean, zero exceptions; riscv64's PLIC_THRESHOLD write now survives (PLIC driver code itself lands separately with 4.3.5b). Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
co-authored by
Claude Sonnet 5
Claude Sonnet 5
parent
06283e5364
commit
36965cf812
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OpenSBI v1.8
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____ _____ ____ _____
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/ __ \ / ____| _ \_ _|
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| | | |_ __ ___ _ __ | (___ | |_) || |
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| | | | '_ \ / _ \ '_ \ \___ \| _ < | |
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| |__| | |_) | __/ | | |____) | |_) || |_
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\____/| .__/ \___|_| |_|_____/|____/_____|
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|_|
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Platform Name : riscv-virtio,qemu
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Platform Features : medeleg
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Platform HART Count : 1
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Platform HART Protection : pmp
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Platform IPI Device : aclint-mswi
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Platform Timer Device : aclint-mtimer @ 10000000Hz
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Platform Console Device : uart8250
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Platform HSM Device : ---
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Platform PMU Device : ---
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Platform Reboot Device : syscon-reboot
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Platform Shutdown Device : syscon-poweroff
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Platform Suspend Device : ---
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Platform CPPC Device : ---
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Firmware Base : 0x80000000
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Firmware Size : 321 KB
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Firmware RW Offset : 0x40000
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Firmware RW Size : 65 KB
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Firmware Heap Offset : 0x47000
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Firmware Heap Size : 37 KB (total), 0 KB (reserved), 12 KB (used), 23 KB (free)
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Firmware Scratch Size : 4096 B (total), 1464 B (used), 2632 B (free)
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Runtime SBI Version : 3.0
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Standard SBI Extensions : ipi,pmu,srst,sse,hsm,rfnc,fwft,time,base,legacy,dbcn,dbtr
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Experimental SBI Extensions : none
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Domain0 Name : root
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Domain0 Boot HART : 0
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Domain0 HARTs : 0*
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Domain0 Region00 : 0x0000000080040000-0x000000008005ffff M: (F,R,W) S/U: ()
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Domain0 Region01 : 0x0000000080000000-0x000000008003ffff M: (F,R,X) S/U: ()
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Domain0 Region02 : 0x0000000000100000-0x0000000000100fff M: (I,R,W) S/U: (R,W)
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Domain0 Region03 : 0x0000000010000000-0x0000000010000fff M: (I,R,W) S/U: (R,W)
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Domain0 Region04 : 0x0000000002000000-0x000000000200ffff M: (I,R,W) S/U: ()
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Domain0 Region05 : 0x000000000c400000-0x000000000c5fffff M: (I,R,W) S/U: (R,W)
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Domain0 Region06 : 0x000000000c000000-0x000000000c3fffff M: (I,R,W) S/U: (R,W)
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Domain0 Region07 : 0x0000000000000000-0xffffffffffffffff M: () S/U: (R,W,X)
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Domain0 Next Address : 0x0000000020000000
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Domain0 Next Arg1 : 0x00000000bfe00000
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Domain0 Next Mode : S-mode
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Domain0 SysReset : yes
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Domain0 SysSuspend : yes
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Boot HART ID : 0
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Boot HART Domain : root
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Boot HART Priv Version : v1.12
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Boot HART Base ISA : rv64imafdch
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Boot HART ISA Extensions : sstc,zicntr,zihpm,zicboz,zicbom,sdtrig,svadu
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Boot HART PMP Count : 16
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Boot HART PMP Granularity : 2 bits
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Boot HART PMP Address Bits : 54
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Boot HART MHPM Info : 16 (0x0007fff8)
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Boot HART Debug Triggers : 2 triggers
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Boot HART MIDELEG : 0x0000000000001666
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Boot HART MEDELEG : 0x0000000000f4b509
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[2J[004D[=3h[2J[009D[2J[004D[8;031;100t[2J[016DRISC-V EDK2 firmware version 2025.11-3ubuntu7
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Press ESCAPE within 5 seconds for boot options ERROR: C40000002:V03051002 I0 6D33944A-EC75-4855-A54D-809C75241F6C 83FFF850
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BdsDxe: failed to load Boot0001 "UEFI Misc Device" fr
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om PciRoot(0x0)/Pci(0x1,0x0): Not Found
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[2J[001;001H[=3h[2J[009DStarKernel UEFI Loader
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Loading kernel from ESP...
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[CKPT 001] Entered efi_main - ConOut live
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Monolithic build - kernel linked directly
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Collecting boot information...
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CmdLine: parsed OK
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[CKPT 004] Command line parsed
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[CKPT 005] Kernel stack allocation decided
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[CKPT 006] Boot info collected (ACPI table located)
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GOP: linear framebuffer found
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[CKPT 007] GOP: linear framebuffer found
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[CKPT 008] About to enter ExitBootServices retry loop
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Calling kernel_main (monolithic)...
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riscv64 4.3.5a probe: satp state at kernel entry
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satp.MODE = 0x000000000000000a
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satp.PPN = 0x00000000000bf868
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__kernel_start = 0x00000000bdd56982
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_____ _ _ __ _
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/ ____| | | |/ / | |
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| (___ | |_ __ _ _ __| ' / ___ _ __ _ __ ___| |
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\___ \| __/ _` | '__| < / _ \ '__| '_ \ / _ \ |
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____) | || (_| | | | . \ __/ | | | | | __/ |
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|_____/ \__\__,_|_| |_|\_\___|_| |_| |_|\___|_|
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LithosAnanke v1.5.4
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Architecture: riscv64
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Build: Aug 8 2026 10:19:17
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UEFI BootServices: EXITED
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=== StarKernel Boot Information ===
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Memory map entries: 78
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Total memory: 1020 MB
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Usable memory: 975 MB
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===================================
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PMM initialized.
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PMM statistics:
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Total pages: 250357
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Free pages : 249705
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Used pages : 652
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Total MB : 977
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Free MB : 975
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Used MB : 2
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VMM initialized (mapped RAM, CR3 switched)
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VMM initialized (mapped RAM, CR3 switched)
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VMM self-test: mapped OK at 0xffff800000000000
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VMM self-test complete.
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IDT installed.
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APIC: init...
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*** EXCEPTION (riscv64) ***
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scause = 0x000000000000000f
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sepc = 0x00000000bdd567f0
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stval = 0x000000000c201000
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